CCD237-Wiring Diagrams

Lecture 15 and 16

Diagrams to show how various parts are connected

Are used often in conjunction with assembly and maintenance instructions

wiring drawings

what are the types of wiring diagrams

point to point

highway

baseline

lineless

straight line

Oldest type
Every path is shown
No codes are used
No experience required to read
Much time is needed to read them

point to point

how do you read a destination code

1-3-V

means going to component one, terminal three, color is violet

also called airline

do not show components in actual location to show even greater simplification

often used when many components are used

drafters considers this style when drawing must fit on smaller sheet

baseline

shows no wiring paths - uses wiring table

can compress very large drawings

will not give a representation of the complexity and size of project

lineless diagram

Component ID’s are written across the top of the sheet
A vertical line goes under the components ID and the terminal
numbers are placed on the line
A horizontal line will extend from component/terminal to
component/terminal
Color ID is placed on the center of the line
Lowest component number on right & low to high going down
on the vertical with terminal points
Approximately 1/2” between lines (use drawing space to the
max)

straight line diagram

show how wires are bound together in bundles

done outside the assembly-components are not in the way

wiring harness or cabling diagram

can support high volume of manufacturing

high priced technicians are not required

quality control is easier

overall, less expensive to produce

prevents damage to the assembly

benefits of bundling cables

drawn exactly to scale - will be used to create the tooling

components must be drawn in their exact location

drawing will indicate where harness posts will be drilled into the routing board

characteristics of a harness diagram

can be automatically assembled and soldered

consistent quality reduces inspection time

lower production cost

can reduce size and weight

there plug in capability makes them easier to service

advantages of printed circuitry 

What are the drawings required for a printed circuit board

• schematic diagram

• space allocation layout

• art work

• soldering mask drawing

• drill drawing

• component outline drawing

• assembly drawing

• sketch work

what are the two systems to place a printed circuit on a circuit board?

etching process

additive process

is printed on the side of the board that has solder and covers that areas that are to have no solder

solder-resistant plastic

what are the notes for design for a circuit board

all components need to be aligned in a common direction

keep conductor paths short as possible
 Avoid sharp turns and
acute angles